Hi there, officially this plant is compact and takes 10-20 years to get to full maturity which is 2.5m high/spread. This tells me that it isn't tryphid type speed by any means. If your question was asked to help you position it, just bear in mind that it will take partial shade and can be hard pruned whenever it finishes flowering (end of your summer). Just 'cos a plant 'can grow that big doesn't mean you have to let it!